International Sweater Vestival

What the day is

International Sweater Vestival is observed on December 4, though the rule is the second Friday after Thanksgiving, so the date moves each year. It asks you to wear a sweater vest to work, and it is an open parody of holidays like it.

Origin and background

The name is a portmanteau of vest and festival. An unrelated event in Knoxville, Tennessee uses the same name, taken from its Vestal neighborhood, and is held in spring, when sweater vests are impractical.

The garment has a more serious history than its reputation suggests. The knitted sleeveless pullover became popular in the early twentieth century as sportswear, particularly for golf, where it solved a genuine problem: it insulates the torso while leaving the arms completely free to swing. The Prince of Wales did a great deal to popularize knitwear of this kind in the 1920s, and the golfing association stuck.

From there it moved into academic and office dress, and eventually became shorthand for a certain kind of unfashionable earnestness, which is the joke the day runs on. It gets reclaimed periodically, usually by people enjoying the irony first and discovering the practicality second.

The practicality is real. Keeping the core warm lets the body tolerate cooler hands and arms, and unrestricted arms matter to anyone who works with their hands or types all day. A vest under a jacket also adds warmth without the bulk that stops sleeves sliding.

How to take part

• Wear one to work, ideally with a colleague, so it reads as deliberate rather than accidental.
• Get the fit right. The vest should end at the waistband, with no shirt bubbling out beneath it.
• Try fine gauge merino if a thick argyle is not your register.
• Layer it over a collared shirt, which is the shape it was cut for.
• Check the actual date each year, since it shifts along with Thanksgiving.